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JSON Interview Questions

Q   |   QA

JSON data is received as a string
Calling eval() will generate JSON object in JavaScript code
var JSONdata = eval(req.responseText);
Once you have JSON object, you can use . notation to access its properties
var name = JSONdata.name;
var address = JSONdata.addresses[3];
var streetname = JSONdata.addresses[3].street;

Create JSON JavaScript object
Use “POST” HTTP method in the open method of the XMLHttpRequest object
Pass JSON JavaScript object in the send method of XMLHttpRequest object
var carAsJSON = JSON.stringify(car);
var url = “JSONExample?timeStamp=” + new Date().getTime(); createXMLHttpRequest();
xmlHttp.open(“POST”, url, true);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded”);
xmlHttp.send(carAsJSON);

Read the JSON data as a String type
Create JSONObject Java object from the string String json = readJSONStringFromRequestBody(request);
//Use the JSON-Java binding library to create a JSON object in Java JSONObject jsonObject = null;
try {
jsonObject = new JSONObject(json);
}
catch(ParseException pe) {
}

JSON-RPC is a simple remote procedure call protocol similar to XML-RPC although it uses the lightweight JSON format instead of XML
JSON-RPC-Java is a Java implementation of the JSON-RPC protocol

It allows you to transparently call server-side Java code from JavaScript with an included lightweight JSON-RPC JavaScript client
It is designed to run in a Servlet container such as Tomcat and can be used with J2EE Application servers to allow calling of plain Java or EJB methods from within a JavaScript DHTML web application

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